$t = explode(':',$tcode);

$ms1 = strpos($t[0], '.') !== false ? explode('.',$t[0])[1] : 0;
$ms1 = is_numeric($ms1) ? $ms1 : 0;

$ms2 = strpos($t[1], '.') !== false ? explode('.',$t[1])[1] : 0;
$ms2 = is_numeric($ms2) ? $ms1 : 0;

$t[0] = intval($t[0]);
$t[1] = intval($t[1]);

$h1 = intval($t[0]/3600);
$t[0] = $t[0] - $h1*3600;
$m1 = intval($t[0]/60);
$t[0] = $t[0] - $m1*60;
$s1 = $t[0];

$h2 = intval($t[1]/3600);
$t[1] = $t[1] - $h2*3600;
$m2 = intval($t[1]/60);
$t[1] = $t[1] - $m2*60;
$s2 = $t[1];

$time1 = str_pad($h1,2,0,STR_PAD_LEFT).':'.str_pad($m1,2,0,STR_PAD_LEFT).':'.str_pad($s1,2,0,STR_PAD_LEFT).','.str_pad($ms1,3,0,STR_PAD_RIGHT);
$time2 = str_pad($h2,2,0,STR_PAD_LEFT).':'.str_pad($m2,2,0,STR_PAD_LEFT).':'.str_pad($s2,2,0,STR_PAD_LEFT).','.str_pad($ms2,3,0,STR_PAD_RIGHT);